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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Heating Rate Sensitive Polyethylene Terephthalate.

Robert David Ludwig Jerusalem1, Michail Maricanov1, Thomas Raidt1

  • 1Department of Biochemical and Chemical Engineering, Biomaterials & Polymer Science, TU Dortmund University, 44221, Dortmund, Germany.

Macromolecular Rapid Communications
|August 13, 2024
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Summary
This summary is machine-generated.

Researchers developed a new smart material, cross-linked polyethylene terephthalate (x-PET), that changes length based on heating rate. This material can sense and respond to dynamic temperature changes for advanced applications.

Keywords:
cross‐linked PETcrystallizationpredictive materialshape memory

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Area of Science:

  • Materials Science
  • Polymer Science
  • Smart Materials

Background:

  • Smart materials respond to external triggers, with future generations sensing trigger dynamics.
  • Current dynamic-sensitive materials are limited, with polymorphous cross-linked syndiotactic polypropylene being the sole example.

Purpose of the Study:

  • To introduce a novel heating rate-sensitive smart material based on cross-linked polyethylene terephthalate (x-PET).
  • To demonstrate x-PET's ability to recognize and react to the dynamics of external thermal triggers.

Main Methods:

  • Cross-linked, fully amorphous quenchable semi-crystalline polyethylene terephthalate (x-PET) was prepared.
  • x-PET was stretched above melting temperature, constrained, and quenched to an amorphous state.
  • The material was heated between 120-170 °C at various rates, and its retraction was analyzed.

Main Results:

  • x-PET exhibited heating rate sensitivity, shrinking to different lengths based on the applied heating rate.
  • The material's retraction initiated above its glass transition temperature (Tg) and was arrested by crystallization.
  • Controlled shrinkage allows for heating rate readout and mechanical process switching.

Conclusions:

  • A new principle for heating rate-sensitive smart materials was demonstrated using x-PET.
  • The dynamic response of x-PET enables novel applications in sensing and mechanical actuation.
  • The interplay between retraction and crystallization governs the material's unique sensitivity to heating rates.